package com.icss.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.icss.beans.User;
import com.icss.daos.UserDao;

public class LoginServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 * 登录验证
	 * author:lhc
	 */
	public LoginServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String action = request.getParameter("action");
		if("login".equals(action)){
			String userName = request.getParameter("userName");
			String password = request.getParameter("userPassword");

			UserDao ud = new UserDao();
			User user = ud.login(userName, password);
			if(user!=null){
				HttpSession session = request.getSession();
				session.setAttribute("User", user);
				request.getRequestDispatcher("/page/oa_index.jsp").forward(request, response);
				ud.close();
			}else{
				PrintWriter out = response.getWriter();
				out
						.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
				out.println("<HTML>");
				out.println("  <HEAD><TITLE>系统登录</TITLE></HEAD>");
				out.println("  <BODY>");
				out.print("  登录失败！！<a href='javascript:history.go(-1)'>返回</a>");
				
				out.println("  </BODY>");
				out.println("</HTML>");
				out.flush();
				out.close();
			}
		}
		
		
		
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
